DP83865-EB National Semiconductor, DP83865-EB Datasheet - Page 58
DP83865-EB
Manufacturer Part Number
DP83865-EB
Description
BOARD EVALUATION DP83865
Manufacturer
National Semiconductor
Datasheet
1.DP83865BVH.pdf
(86 pages)
Specifications of DP83865-EB
Main Purpose
Interface, Ethernet
Utilized Ic / Part
DP83865
Lead Free Status / RoHS Status
Not applicable / Not applicable
- Current page: 58 of 86
- Download datasheet (592Kb)
www.national.com
4.0 Functional Description
after the last bit, carrier sense is de-asserted. Receive
clock stays active for at least five more bit times after CRS
goes low, to guarantee the receive timings of the controller.
The aligned NRZ data is then parallized and aligned to 4-
bit nibbles that is presented to the MII.
4.8.4 Link Detector
In 10 BASE-T mode, the link detection circuit checks for
valid NLP pulses transmitted by the remote link partner. If
valid link pulses are not received the link detector will dis-
able the twisted pair transmitter, receiver and collision
detection functions.
4.8.5 100 BASE-TX ADC Block
The DP83865 requires no external attenuation circuitry at
its receive inputs, MDI+/-. It accepts TP-PMD compliant
waveforms directly from a 1:1 transformer. The analog
MLT-3 signal (with noise and system impairments) is
received and converted to the digital domain via an Analog
10BASE-T
MANCHESTER
4-BIT NIBBLE
RECOVERY
DECODER
RXD[3:0] /
RECEIVER
CLOCK &
TO NRZ
DEMUX
RX_ER
DATA
Figure 8. 10BASE-T/100BASE-T Receive Block Diagram
10BASE-T
(Continued)
LINK DETECT
DETECT
LINK
MDI
RECOVERY
58
RX_CLK
DIVIDER
CLOCK
to Digital Converter (ADC) to allow for Digital Signal Pro-
cessing (DSP) to take place on the received signal.
4.8.6 BLW / EQ / AAC Correction
The digital data from the ADC block flows into the DSP
Block (BLW/EQ/AAC Correction) for processing. The DSP
block applies proprietary processing algorithms to the
received signal and are all part of an integrated DSP
receiver. The primary DSP functions applied are:
— BLW is defined as the change in the average DC con-
tent, over time, of an AC coupled digital transmission
over a given transmission medium. (i.e. copper wire).
BLW results from the interaction between the low fre-
quency components of a transmitted bit stream and the
frequency response of the AC coupling component(s)
within the transmission system. If the low frequency con-
tent of the digital bit stream goes below the low frequen-
cy pole of the AC coupling transformer then the droop
characteristics of the transformer will dominate resulting
100BASE-TX
5B/4B DECODER
CORRECTN
DESCRAMB
PARALLEL
RXD[3:0] /
SERIAL
MLT-3
LOGIC
AAC
BLW
RX_ER
LER
NRZ
EQ
ADC
TO
TO
100BASE-TX
SIGNAL DETECT
DETECT
SIGNAL
Related parts for DP83865-EB
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
National Semiconductor [8-Bit D/A Converter]
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
National Semiconductor [Media Coprocessor]
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
AC97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound
Manufacturer:
National Semiconductor
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
8-bit 20 MSPS flash A/D converter.
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Low Noise Quad Operational Amplifier
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Quad Differential Line Receivers
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Quad High Speed Trapezoidal? Bus Transceiver
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Dual Line Receiver
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
TTL to 10k ECL Level Translator with Latch
Manufacturer:
National Semiconductor
Datasheet: